Download 219 III (i) (ii)

219
Total No. of Questions - 2l
Total No. of Printed Pages - 02
Regd.
2 k
6 o 6
No.
6
6
Part - III
PHYSICS, Paper-II
(English Version)
llllax. Marks : 60
Time:3 Hoursl
SECTION
(i)
(ii)
-
A
10
x
2:20
Answer all questions.
Each question carries two marks.
(iii) All are very short answer type questions'
l.
What is Hypermetropia ? How can it be corrected
2.
How do you convert a moving coil galvanometer into a voltmeter
3.
Magnetic lines form continuous closed loops. Why
4.
Define Magnetisation of a sample' What is its SI unit
5.
what is the phenomenon involved in the working of a transfonner
6.
Give two uses of Infrared RaYs.
7.
write down
8.
The work function of cesium is 2.14 eV. Find the threshold frequency for cesium.
(Take
?
?
?
de Broglie's relation and explain the terms therein.
h= 6.6x
10-34 Js)
9.
In which bias can azefler diode be used as voltage regulator
10.
Define Modulation. Mention the basic methods of modulation.
219 (Day-10)
?
?
P.T.O.
4<
6x4:24
SECTION _ B
l
' ,' (i)
(ii)
Note :
(iii)
llr
Answer any six of the following questions'
Each question carries
All
four marks'
are short anslver type questions'
Explain the formation of a mitage..7
12..- Derive the expression for the intensity at a point where interference
Arrive at the conditions for maximum and zero intensity. ,--
of light occurs.
'/
due
Define intensity of electric field at a point. Derive an expression for the intensity
to a point charge.
13/'
-
14.
Derive an expression for the capacitance of a parallel plate capacitor'
15.
Derive an expression for the magnetic dipole moment of a ievolving electron.
16.( Describe the ways in which Eddy currents are used to advantage.
'
17.
State the basic postulates of Bohr's theory of atomic spectra.
l8-
Describe how a semiconductor diode is used as a half-wave rectifier'
Note:
(i)
(ii)
SECTION - C
Answer any two of the following questions'
Each question carries eight marks.
(iii)
All
,
2x8:16
are long answer type questions.
What is Doppler effect ? Obtain an expression for the apparent frequency of
at rest.
sound heard when the source is in motion with respect to an observer
(b)
20.
(a)
A rocket is moving at a speed of 200 ms-l towards a stationary target' While
the
moving, it emits a wave of frequency 1000 Hz. Calculate the frequency of
sound as detected by the target. (Velocity of sound in air is 330 ms-l)
of potentiometer. Explain w'ith the help of circuit
,diagram how the emf of two primary cells are compared by using the
State the working principle
potentiometer.
wire is 5 m long and a potential difference of 6 V is
a
maintained between its ends. Find the emf of a cell which balances against
length of 180 cm of the potentiometer wire'
(b) A potentiometer
help of a labelled
Explain the principle and working of a nuclear reactor with the
diagram.
219
{Day-l0)